Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
readOnlyHint=true already tells the agent this is a safe, non-mutating read, so the description is not carrying the safety burden. It confirms the per-profile scoping but says nothing about pagination, result size, or what an empty/unknown profile returns. With annotations covering the safety profile, this is the acceptable minimum for a simple list tool.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.